Best website solution for lots of products

Hello all, using shopify currently for one of my sites but seem to stumble upon the pages continously being indexed and then dropped out of the index, then reindexed etc. I think it's a shopify wide problem they are trying to avoid fixing. Anyway I have had enough but need to take my site elsewhere.

We have products in the range of 20k plus and need a new e-commerce platform to move to. I moved from magento to shopify but don't want to go back to magento. Any suggestions that can handle a site with this many products and still be quick enough to use for the user and great for seo.

Thanks

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I learnt the hard way, thought shopify would be great as i am not that technical when it comes to websites. However after using shopify - brilliant asthetically, but it just did not rank the product pages. Played with different themes etc, googled some so called solutions, asked shopify experts only to be told the same thing.

Magento - everyone within the office knows the backend quite well - so we have moved back to it. Will however keep in mind woocommerce and open cart in the future.

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I found a couple of solutions. Of course, it is simpler with a code, but if you don't have programmers you can do the following:
1st - exporting your data to a CSV and importing it via Magento Dataflow. Note that this method requires very careful formatting of your current data. If successful, Dataflow will leave your current gallery images and product relations intact. There is also an option of purchasing an extension that will increase this functionality.
You can read about converting to a CSV on Shopify support.
2nd - I still can't insert links, so just type - How to migrate data from Shopify to Magento video tutorial.
It is about all data migration, but I think would be useful too.
Hope it would be useful. But I'll go with Magento 2. It's complicated, but SEO is great, and also future updates would be awesome. I already can't wait for the next Magento versions.

I agree that Wordpress/WooCommerce is a good option. Our kids toys online shop was built on Wordpress with WooCommerce plugin. It's easy to setup and maintain. At the moment we have only over 1.5K products.

xcart - without a shadow of a doubt for sites with large numbers of products. You have to host it yourself - there is a cloud option as well (which may suit if you are not technical)
There is also CDSEO pro - which completes the seo side of things.

Avoid avoid avoid magento. The other option I would use is prestashop, plenty of support and addons - as does xcart